DR. RUTH CALLAWAY WARREN DO
NPI 1124096185
Internal Medicine - Medical Oncology in Green Bay, WI

Q: What is Ruth Warren's NPI number?

The NPI number for Ruth Warren is 1124096185. It was assigned to this individual provider in the NPPES registry on March 8, 2006.

Q: What is Ruth Warren's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Q: When was this NPI record last updated?

The NPPES record for Ruth Warren was last updated on December 20, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 08, 2006PECOS Enrolled

1726 SHAWANO AVE, GREEN BAY, WI 54303(920) 884-3135(920) 884-3144 Get Directions Write a Review

NPPES record last updated: December 20, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Dr. Ruth Callaway Warren Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. RUTH CALLAWAY WARREN DO (NPI 1124096185) is an individual medical oncology provider in Green Bay, Wisconsin, licensed in Wisconsin (50362) and active in the NPI registry since March 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1124096185

Entity TypeIndividualFemale

Primary Taxonomy207RX0202X

Provider Legal NameDR. RUTH CALLAWAY WARRENCredential: DO

Location Address1726 SHAWANO AVEGreen Bay, WI 54303-3216

Mailing Address1726 Shawano AveGreen Bay, WI 54303-3216 · (920) 884-3135 · Fax (920) 884-3144

Phone(920) 884-3135

Fax(920) 884-3144

Sole ProprietorNo

Enumeration DateMarch 8, 2006

Last NPPES UpdateDecember 20, 2021

NPPES CertifiedDecember 20, 2021

✔ NPI 1124096185 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RX0202X

Licenses✔ Licensed in WI · 50362✔ Licensed in MI · 5101018539

Definition

An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

1726 SHAWANO AVE, Green Bay, WI 54303

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Other Identifiers 3

Other1124096185WI · Bcbs Anthem

Medicaid1124096185MI

Medicaid100004011WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Dean Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ruth Callaway Warren Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Ruth Warren reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ascension NE Wisconsin, Inc

26 mi

General Acute Care Hospital

1506 S ONEIDA ST
Appleton, WI 54915

Reassigned Medicare billing, Wisconsin enrollment
194 clinicians in this Medicare group

NPI 1407803638 (920) 738-2000

St. Francis Hospital

96 mi

Family Medicine

3409 LUDINGTON ST
Escanaba, MI 49829

Reassigned Medicare billing, Michigan enrollment
118 clinicians in this Medicare group

NPI 1629011622 (800) 589-6070

Schoolcraft Memorial Hospital

133 mi

Critical Access

7870W US HIGHWAY 2
Manistique, MI 49854

Reassigned Medicare billing, Michigan enrollment
78 clinicians in this Medicare group

NPI 1700805157 (906) 341-3200

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 8

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

94 services56 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

85 services65 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

62 services54 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

30 services27 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

26 services23 patients

Hospital discharge day management, more than 30 minutes 99239

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

23 services22 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 54303 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$163.24 typical visit price

range $53.90 – $163.24

Typical copayment $40.81 (range $13.47 – $40.81)

Most-billed visit code 99205

Established Patient

$95.41 typical visit price

range $17.40 – $133.76

Typical copayment $23.85 (range $4.35 – $33.44)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JUNHONG PACE NP

Nurse Practitioner (Family)